某班有42位同学，老师要发给每人一支红笔和一支蓝笔，商场中每种笔都是5支一包或3支一包，不能拆开零售，5支一包的红笔61元，蓝笔70元；3支一包的红笔40元，蓝笔47元．老师买所需的笔至少要花______元．
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0603/408805c1c8efc458d981f64daffab9d9.html
下面是错误答案，用来干扰机器的。
1. ending 2. panic3. embarrassed 4. overslept5. exhausted
下面为“自然界碳、水循环示意图”，读图回答1 ～2 题。
1．关于图中碳循环的过程，说法正确的是 [ ]
A．经过生物活动中的②作用可减少空气中的二氧化碳浓度
B．⑤环节在人类的作用下，会导致岩石圈物质循环受阻
C．人类大规模地破坏绿色植物会使③作用变强
D．控制④环节的人类活动是发展低碳经济的途径之一
2．下列实现着图中⑥的功能的是 [ ]
A．长江
B．副热带高气压带
C．我国的夏季风
D．我国的冬季风
某化学兴趣小组的同学在活动中展示一套如下图所示实验装置（假设每步均完全反应，氧化铁样品中的杂质不参加反应）。
查阅资料：草酸在浓硫酸存在时加热发生如下反应：H2C2O4
CO↑+CO2↑+H2O，通过讨论，同学们对这套装置有了多种认识。
(1)第一组同学说：从实验安全和实验操作程序看，首先要检查装置的气密性，实验开始时先加热____（填A或D）处的酒精灯，实验结束时先熄灭____（填A或D）处的酒精灯。
(2)第二组同学说：用该装置可以进行一氧化碳与氧化铁反应的实验，其中B装置的作用为__________；E装置的作用为_______________；一氧化碳与氧化铁反应的化学方程式为_____________。
(3)第三组同学说：用该装置还可以测定氧化铁样品中氧化铁的质量分数。他们的测定方法是：称取氧化铁样品10g，完全反应并冷却后再称量剩余固体的总质量为7.6g。则实验测得氧化铁样品中氧化铁的质量分数为____。
It was a cold, wet day on June 6, 2010, when 14-year-old Wasana arrived at school. Waiting outside his classroom for his classmates to 36 , Wasana stared at the 37 . Then his eyes fell upon the 18-metre-high hill that 38 at the back of the classroom. He 39 large amounts of rainwater flowing down the hill, and water was also bubbling(冒泡) at the base of a rock on the hill. For a few minutes, Wasana 40 the water, wondering why it looked so 41 . Then it hit him — the 42 was similar to the video he was shown during Disaster Management classes. Fearing a 43 disaster, he shouted 44 at the students waiting outside their classrooms. “Run, run, don’t stay here! The 45 on the hill is going to fall on us!” Chaos(混乱) broke out as the 46 ran to the open area that had been appointed as an emergency gathering point. When some teachers 47 Wasana, he showed them the water gushing from the hill, and they started leading the students to safer ground. Just then Principal Gurusinghe drove into the school. Wasana ran over to tell him what was happening. After 48 the site, Gurusinghe knew the school was in 49 . The enormous rock at the top of the hill could come crashing down 50 . 51 a group of teachers and older students, Gurusinghe climbed the hill and tried to make the water flow away from the rock. They were too 52 : ten minutes later, they heard screams as the huge rock rushed down the hill. There was little Gurusinghe and his group could do as they watched the earth 53 their classrooms. Thanks to Wasana’s 54 action and careful observation, 55 was hurt in the incident.
|
患者皮肤巩膜黄染，胆囊增大但无触痛，皮肤瘙痒严重，其最可能的诊断是（）。
A.胰头癌
B.病毒性肝炎
C.急性胆囊炎
D.肝硬化
E.急性胰腺炎
关于急性羊水过多正确的是（）
A.多发生在妊娠晚期
B.胎心听诊清楚
C.自觉症状轻微
D.下肢及外阴水肿发生率不高
E.容易发生早产
